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Microsoft Host Integration Server 2006 Command Execution Vulnerability

14.10.08

BACKGROUND

The Host Integration Server is an application suite that is used to communicate with IBM mainframe servers. One of the components of the suite is a remote management interface. This interface is implemented by an RPC server that listens on a dynamic TCP port. The UUID of the vulnerable RPC service is 'ed6ee250-e0d1-11cf-925a-00aa00c006c1'. For more information regarding the Host Integration Server, see the vendor's website found at the following URL.

http://www.microsoft.com/hiserver/default.mspx

DESCRIPTION

Remote exploitation of an arbitrary command execution vulnerability in Microsoft Corp.'s Host Integration Server 2006 could allow an attacker to execute arbitrary code with the privileges of the affected service.

The RPC interface exposes several methods that an unauthenticated attacker can use to execute arbitrary programs on the server. RPC opcodes 1 and 6 both allow an attacker to call the CreateProcess() function with full control over the application started, as well as the command line passed to it. This allows an attacker to run arbitrary programs on the server.

ANALYSIS

Exploitation of this vulnerability results in the execution of arbitrary code with the privileges of the affected service. The privileges gained depend on the user account that the Host Integration Server is configured to use during installation. The service does not require SYSTEM privileges to run.

DETECTION

iDefense has confirmed the existence of this vulnerability in Host Integration Server 2006. Previous versions may also be affected.

WORKAROUND

Use the Service Control Manager to disable the SNA RPC service, and prevent it from starting automatically. This will prevent the vulnerable service from running, but will also prevent remote management. Firewalling the TCP port is not a valid workaround, since the port used for communication is dynamically assigned when the service starts.

VENDOR RESPONSE

Microsoft has officially addressed this vulnerability with Security Bulletin MS08-059. For more information, consult their bulletin at the following URL.

http://www.microsoft.com/technet/security/bulletin/ms08-059.mspx

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2008-3466 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

DISCLOSURE TIMELINE

05/27/2008 Initial vendor notification.
05/27/2008 Initial vendor response.
10/14/2008 Coordinated public disclosure.

CREDIT

This vulnerability was reported to iDefense by Stephen Fewer of Harmony Security | (www.harmonysecurity.com ).

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LEGAL NOTICES

Copyright © 2008 Verisign, Inc.

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Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.